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Restructure representation of aggregate functions so that they have pg_proc

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entries, per pghackers discussion.  This fixes aggregates to live in
namespaces, and also simplifies/speeds up lookup in parse_func.c.
Also, add a 'proimplicit' flag to pg_proc that controls whether a type
coercion function may be invoked implicitly, or only explicitly.  The
current settings of these flags are more permissive than I would like,
but we will need to debate and refine the behavior; for now, I avoided
breaking regression tests as much as I could.
This commit is contained in:
Tom Lane
2002-04-11 20:00:18 +00:00
parent 3f6299df6c
commit 902a6a0a4b
63 changed files with 2530 additions and 2440 deletions
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91
src/backend/commands/define.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/define.c,v 1.74 2002/04/09 20:35:47 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/define.c,v 1.75 2002/04/11 19:59:57 tgl Exp $
*
* DESCRIPTION
* The "DefineFoo" routines take the parse tree and pick out the
@ -141,13 +141,56 @@ compute_return_type(TypeName *returnType, Oid languageOid,
*returnsSet_p = returnType->setof;
}
static void
compute_full_attributes(List *parameters,
int32 *byte_pct_p, int32 *perbyte_cpu_p,
int32 *percall_cpu_p, int32 *outin_ratio_p,
bool *isStrict_p, char *volatility_p)
/*
* Interpret the argument-types list of the CREATE FUNCTION statement.
*/
static int
compute_parameter_types(List *argTypes, Oid languageOid,
Oid *parameterTypes)
{
int parameterCount = 0;
List *x;
MemSet(parameterTypes, 0, FUNC_MAX_ARGS * sizeof(Oid));
foreach(x, argTypes)
{
TypeName *t = (TypeName *) lfirst(x);
Oid toid;
if (parameterCount >= FUNC_MAX_ARGS)
elog(ERROR, "functions cannot have more than %d arguments",
FUNC_MAX_ARGS);
toid = LookupTypeName(t);
if (OidIsValid(toid))
{
if (!get_typisdefined(toid))
elog(WARNING, "Argument type \"%s\" is only a shell",
TypeNameToString(t));
}
else
{
char *typnam = TypeNameToString(t);
if (strcmp(typnam, "opaque") == 0)
{
if (languageOid == SQLlanguageId)
elog(ERROR, "SQL functions cannot have arguments of type \"opaque\"");
toid = InvalidOid;
}
else
elog(ERROR, "Type \"%s\" does not exist", typnam);
}
if (t->setof)
elog(ERROR, "functions cannot accept set arguments");
parameterTypes[parameterCount++] = toid;
}
return parameterCount;
}
/*-------------
* Interpret the parameters *parameters and return their contents as
* *byte_pct_p, etc.
@ -155,7 +198,10 @@ compute_full_attributes(List *parameters,
* These parameters supply optional information about a function.
* All have defaults if not specified.
*
* Note: currently, only two of these parameters actually do anything:
* Note: currently, only three of these parameters actually do anything:
*
* * isImplicit means the function may be used as an implicit type
* coercion.
*
* * isStrict means the function should not be called when any NULL
* inputs are present; instead a NULL result value should be assumed.
@ -168,6 +214,13 @@ compute_full_attributes(List *parameters,
* for a long time.
*------------
*/
static void
compute_full_attributes(List *parameters,
int32 *byte_pct_p, int32 *perbyte_cpu_p,
int32 *percall_cpu_p, int32 *outin_ratio_p,
bool *isImplicit_p, bool *isStrict_p,
char *volatility_p)
{
List *pl;
/* the defaults */
@ -175,6 +228,7 @@ compute_full_attributes(List *parameters,
*perbyte_cpu_p = PERBYTE_CPU;
*percall_cpu_p = PERCALL_CPU;
*outin_ratio_p = OUTIN_RATIO;
*isImplicit_p = false;
*isStrict_p = false;
*volatility_p = PROVOLATILE_VOLATILE;
@ -182,7 +236,9 @@ compute_full_attributes(List *parameters,
{
DefElem *param = (DefElem *) lfirst(pl);
if (strcasecmp(param->defname, "isstrict") == 0)
if (strcasecmp(param->defname, "implicitcoercion") == 0)
*isImplicit_p = true;
else if (strcasecmp(param->defname, "isstrict") == 0)
*isStrict_p = true;
else if (strcasecmp(param->defname, "isimmutable") == 0)
*volatility_p = PROVOLATILE_IMMUTABLE;
@ -276,11 +332,14 @@ CreateFunction(ProcedureStmt *stmt)
Oid languageOid;
char *funcname;
Oid namespaceId;
int parameterCount;
Oid parameterTypes[FUNC_MAX_ARGS];
int32 byte_pct,
perbyte_cpu,
percall_cpu,
outin_ratio;
bool isStrict;
bool isImplicit,
isStrict;
char volatility;
HeapTuple languageTuple;
Form_pg_language languageStruct;
@ -316,9 +375,13 @@ CreateFunction(ProcedureStmt *stmt)
compute_return_type(stmt->returnType, languageOid,
&prorettype, &returnsSet);
parameterCount = compute_parameter_types(stmt->argTypes, languageOid,
parameterTypes);
compute_full_attributes(stmt->withClause,
&byte_pct, &perbyte_cpu, &percall_cpu,
&outin_ratio, &isStrict, &volatility);
&outin_ratio, &isImplicit, &isStrict,
&volatility);
interpret_AS_clause(languageOid, languageName, stmt->as,
&prosrc_str, &probin_str);
@ -335,18 +398,20 @@ CreateFunction(ProcedureStmt *stmt)
languageOid,
prosrc_str, /* converted to text later */
probin_str, /* converted to text later */
false, /* not an aggregate */
true, /* (obsolete "trusted") */
isImplicit,
isStrict,
volatility,
byte_pct,
perbyte_cpu,
percall_cpu,
outin_ratio,
stmt->argTypes);
parameterCount,
parameterTypes);
}
/*
* DefineOperator
* this function extracts all the information from the